Question

factorise mrayspower4 -256

Answer 1

x^4-256 can be factorised as

(x^2+16).(x^2-16) and this is the answer.

Answer 2

Given, m^4 - 256

            (m^2)^2 - 16^2

           (m^2 + 16)(m^2 - 16)

           (m^2 + 16)(m+4)(m-4).